已知矩阵A, 求关于A的特征多项式 ,麻烦老师了

A=0 0 1
0 1 0
1 0 0

特征值x
特征多项式
|xE-A|=
x.0.-1
0.x-1.0
-1.0.,x
r3+r1
x.0.-1
0.x-1.0
x-1,0,x-1
=(x-1)
x.0.-1
0.x-1.0
1.0.1
c1-c3
=(x-1)
x+1.0.-1
0.x-1.0
0.0.1
=(x+1)(x-1)^2=0
x=1.1.-1
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